{"id":"46106558-7093-40cc-9fb9-85576b085683","shortId":"XVnXjN","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header to each request.\n\nThe specific endpoint at `/api/v1/wire/160` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The challenge specifies an exact payment scheme with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/wire/160` endpoint actually returns. The platform advertises categories like sentiment analysis, text summarization, embeddings, geocoding, price feeds, and more, but without documentation it is unclear what specific functionality the `wire/160` route provides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response"],"categories":["api-platform","data","ai","finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /api/v1/wire/160","The purpose of the specific 'wire/160' endpoint is unknown; 'Premium API Access' is a generic label","The platform lists many endpoint categories but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/160","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wire/160","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what /api/v1/wire/160 actually does or returns. No OpenAPI spec, no request/response schemas, and all doc pages render only 'Connect wallet'. The listing is effectively a stub with confirmed pricing and liveness but no functional 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'/api/v1/wire/160':112,204 '/docs':172 '/pricing':173 '/readme':176 '/request':19,38 '0.02':18,37,70,138 '000':128 '0x8335':133 '20':127 '300':152 '402':122 '6':141 'Base network API' 'USDC micropayment API' 'accept':157 'access':118 'actual':206 'advertis':210 'ai':12,31,57 'analysi':214 'analyt':56 'api':5,24,45,88,117 'application/json':162 'attach':99 'base':8,27,78,129,135 'beyond':164 'broad':50 'call':4,23 'caller':97 'catalog':51 'categori':211 'challeng':123,144 'commit':96 'connect':182 'content':188 'cover':10,29 'crypto-paid API' 'data':11,30,55 'decim':142 'document':163,197,225 'embed':217 'enabl':44 'endpoint':16,35,53,66,110,156,205 'equal':137 'everi':65 'exact':147 'exampl':200 'extrem':169 'feed':220 'financ':13,32,60 'function':231 'geocod':218 'header':104 'http':158 'http-post' 'infrastructur':63 'json-response' 'key':89 'land':166 'learn':59 'like':212 'limit':92 'list':114 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'minimum':95 'network':79 'offer':48 'openapi':192 'page':167,177 'paid':73 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':83,103,148 'per':3,22,71 'platform':6,25,46,209 'post':159 'premium':116 'price':68,219 'prompt':184 'protocol':84 'provid':235 'rate':91 'render':179 'request':72,107,124 'request/response':195 'return':120,161,207 'rout':234 'schema':196 'scheme':149 'second':153 'sentiment':213 'simpli':98 'span':54 'spars':170 'spec':193 'specif':109,230 'specifi':145 'summar':216 'text':215 'timeout':154 'unclear':228 'unit':130 'usdc':9,28,75,132,139 'usdc-base' 'use':140 'util':15,34,64 'via':80 'wallet':183 'web3':61 'wire/160':233 'without':224 'x':102 'x-payment':101 'x402':43,82 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"aabec845-d2ef-4bc9-8bca-96ba7a3e21f0","listingId":"46106558-7093-40cc-9fb9-85576b085683","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wire/160","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:47.157Z"}],"sources":[{"listingId":"46106558-7093-40cc-9fb9-85576b085683","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/160","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:47.157Z","lastSeenAt":"2026-04-22T07:32:00.182Z"}],"details":{"listingId":"46106558-7093-40cc-9fb9-85576b085683","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/160 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/wire/160"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/160"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reports via per-request micropayments","Running AI inference (sentiment, summarization, classification, embeddings) without API keys","Fetching financial data like token quotes, exchange rates, and gas estimates","Using utility services like geocoding, validation, and conversion"],"bestFor":["Developers who want keyless, pay-as-you-go API access","Agents and bots that can settle x402 payments in USDC on Base","Users who prefer no-commitment, no-rate-limit API consumption"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-volume bulk access at discounted rates","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.213Z"},"updatedAt":"2026-04-22T07:32:00.182Z"}}